Giant sequoia
Sequoiadendron giganteum · Cupressaceae
📷 Mike Murphy (talk · contribs) · CC BY-SA 3.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around giant sequoia and prepare for winter.
ID card
- Scientific name
- Sequoiadendron giganteum
- Family
- Cupressaceae
- Type
- Evergreen conifer
- Adult size
- 50 to 85 m tall, 7 to 11 m wide
- Growth
- Fast to moderate, 60 cm per year under optimal conditions
- Hardiness
- -15 to -20 °C
- Origin
- Sierra Nevada (California)
- Foliage
- Evergreen, dark green scales
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Growth is slow for the first ten years (20-30 cm/year), then it speeds up: be patient and protect young plants from strong winds. No fertilizer is needed in decent soil.
The common mistake
Gardeners plant young seedlings that are too small in windy exposed spots.
The pro's trick
Discretely stake young giant sequoias for the first three years with a flexible stake that breaks before the trunk snaps in a strong gust.
Care
Sunlight
The giant sequoia demands maximum sunlight to develop harmoniously. Plant it in full sun, sheltered from strong winds that could weaken the trunk. An open location also promotes healthy air circulation and reduces the risk of fungal diseases.
Soil and planting
Choose a deep, well-draining soil rich in organic matter. The sequoia tolerates slightly acidic to neutral soils. Avoid compacted or excessively chalky soils. Adding compost at planting time helps establish the roots.
Watering
Water your young sequoia regularly and generously, especially during the first and second year after planting, to ensure good root establishment. Once established, reduce watering but keep the soil moist during prolonged dry spells. Mulch helps retain moisture.
Nutrition
In its natural habitat, the sequoia needs no fertilizer. In cultivation, a light application of well-decomposed compost or balanced fertilizer in spring is sufficient. Avoid excess nitrogen, which unbalances the plant's structure.
Pruning and maintenance
The sequoia requires almost no ornamental pruning; its pyramidal shape develops naturally. Remove only dead or damaged branches in late winter. Young plants can be gently guided to encourage a straight-growing crown.
Diseases and pests
The sequoia is very robust and rarely susceptible to diseases in temperate climates. Stagnant excess moisture can promote root rot: ensure impeccable drainage. Watch for the rare appearance of scale insects or mites during extremely dry conditions.
Did you know?
Sequoiadendron giganteum is the most voluminous tree on Earth: the most famous specimen, nicknamed 'General Sherman,' stands over 83 meters tall with a trunk reaching 11 meters in diameter. Discovered in California in the nineteenth century, it has fascinated botanists worldwide and remains a living symbol of North American forest majesty.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.